mirror of
https://github.com/autc04/Retro68.git
synced 2024-08-30 17:29:33 +00:00
388 lines
10 KiB
C
388 lines
10 KiB
C
/* Copyright (C) 2007, 2008, 2009, 2011 Free Software Foundation, Inc.
|
|
Contributed by Richard Henderson <rth@redhat.com>.
|
|
|
|
This file is part of the GNU OpenMP Library (libgomp).
|
|
|
|
Libgomp is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3, or (at your option)
|
|
any later version.
|
|
|
|
Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* This file handles the maintainence of tasks in response to task
|
|
creation and termination. */
|
|
|
|
#include "libgomp.h"
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
|
|
/* Create a new task data structure. */
|
|
|
|
void
|
|
gomp_init_task (struct gomp_task *task, struct gomp_task *parent_task,
|
|
struct gomp_task_icv *prev_icv)
|
|
{
|
|
task->parent = parent_task;
|
|
task->icv = *prev_icv;
|
|
task->kind = GOMP_TASK_IMPLICIT;
|
|
task->in_taskwait = false;
|
|
task->in_tied_task = false;
|
|
task->final_task = false;
|
|
task->children = NULL;
|
|
gomp_sem_init (&task->taskwait_sem, 0);
|
|
}
|
|
|
|
/* Clean up a task, after completing it. */
|
|
|
|
void
|
|
gomp_end_task (void)
|
|
{
|
|
struct gomp_thread *thr = gomp_thread ();
|
|
struct gomp_task *task = thr->task;
|
|
|
|
gomp_finish_task (task);
|
|
thr->task = task->parent;
|
|
}
|
|
|
|
static inline void
|
|
gomp_clear_parent (struct gomp_task *children)
|
|
{
|
|
struct gomp_task *task = children;
|
|
|
|
if (task)
|
|
do
|
|
{
|
|
task->parent = NULL;
|
|
task = task->next_child;
|
|
}
|
|
while (task != children);
|
|
}
|
|
|
|
/* Called when encountering an explicit task directive. If IF_CLAUSE is
|
|
false, then we must not delay in executing the task. If UNTIED is true,
|
|
then the task may be executed by any member of the team. */
|
|
|
|
void
|
|
GOMP_task (void (*fn) (void *), void *data, void (*cpyfn) (void *, void *),
|
|
long arg_size, long arg_align, bool if_clause, unsigned flags)
|
|
{
|
|
struct gomp_thread *thr = gomp_thread ();
|
|
struct gomp_team *team = thr->ts.team;
|
|
|
|
#ifdef HAVE_BROKEN_POSIX_SEMAPHORES
|
|
/* If pthread_mutex_* is used for omp_*lock*, then each task must be
|
|
tied to one thread all the time. This means UNTIED tasks must be
|
|
tied and if CPYFN is non-NULL IF(0) must be forced, as CPYFN
|
|
might be running on different thread than FN. */
|
|
if (cpyfn)
|
|
if_clause = false;
|
|
if (flags & 1)
|
|
flags &= ~1;
|
|
#endif
|
|
|
|
if (!if_clause || team == NULL
|
|
|| (thr->task && thr->task->final_task)
|
|
|| team->task_count > 64 * team->nthreads)
|
|
{
|
|
struct gomp_task task;
|
|
|
|
gomp_init_task (&task, thr->task, gomp_icv (false));
|
|
task.kind = GOMP_TASK_IFFALSE;
|
|
task.final_task = (thr->task && thr->task->final_task) || (flags & 2);
|
|
if (thr->task)
|
|
task.in_tied_task = thr->task->in_tied_task;
|
|
thr->task = &task;
|
|
if (__builtin_expect (cpyfn != NULL, 0))
|
|
{
|
|
char buf[arg_size + arg_align - 1];
|
|
char *arg = (char *) (((uintptr_t) buf + arg_align - 1)
|
|
& ~(uintptr_t) (arg_align - 1));
|
|
cpyfn (arg, data);
|
|
fn (arg);
|
|
}
|
|
else
|
|
fn (data);
|
|
if (team != NULL)
|
|
{
|
|
gomp_mutex_lock (&team->task_lock);
|
|
if (task.children != NULL)
|
|
gomp_clear_parent (task.children);
|
|
gomp_mutex_unlock (&team->task_lock);
|
|
}
|
|
gomp_end_task ();
|
|
}
|
|
else
|
|
{
|
|
struct gomp_task *task;
|
|
struct gomp_task *parent = thr->task;
|
|
char *arg;
|
|
bool do_wake;
|
|
|
|
task = gomp_malloc (sizeof (*task) + arg_size + arg_align - 1);
|
|
arg = (char *) (((uintptr_t) (task + 1) + arg_align - 1)
|
|
& ~(uintptr_t) (arg_align - 1));
|
|
gomp_init_task (task, parent, gomp_icv (false));
|
|
task->kind = GOMP_TASK_IFFALSE;
|
|
task->in_tied_task = parent->in_tied_task;
|
|
thr->task = task;
|
|
if (cpyfn)
|
|
cpyfn (arg, data);
|
|
else
|
|
memcpy (arg, data, arg_size);
|
|
thr->task = parent;
|
|
task->kind = GOMP_TASK_WAITING;
|
|
task->fn = fn;
|
|
task->fn_data = arg;
|
|
task->in_tied_task = true;
|
|
task->final_task = (flags & 2) >> 1;
|
|
gomp_mutex_lock (&team->task_lock);
|
|
if (parent->children)
|
|
{
|
|
task->next_child = parent->children;
|
|
task->prev_child = parent->children->prev_child;
|
|
task->next_child->prev_child = task;
|
|
task->prev_child->next_child = task;
|
|
}
|
|
else
|
|
{
|
|
task->next_child = task;
|
|
task->prev_child = task;
|
|
}
|
|
parent->children = task;
|
|
if (team->task_queue)
|
|
{
|
|
task->next_queue = team->task_queue;
|
|
task->prev_queue = team->task_queue->prev_queue;
|
|
task->next_queue->prev_queue = task;
|
|
task->prev_queue->next_queue = task;
|
|
}
|
|
else
|
|
{
|
|
task->next_queue = task;
|
|
task->prev_queue = task;
|
|
team->task_queue = task;
|
|
}
|
|
++team->task_count;
|
|
gomp_team_barrier_set_task_pending (&team->barrier);
|
|
do_wake = team->task_running_count + !parent->in_tied_task
|
|
< team->nthreads;
|
|
gomp_mutex_unlock (&team->task_lock);
|
|
if (do_wake)
|
|
gomp_team_barrier_wake (&team->barrier, 1);
|
|
}
|
|
}
|
|
|
|
void
|
|
gomp_barrier_handle_tasks (gomp_barrier_state_t state)
|
|
{
|
|
struct gomp_thread *thr = gomp_thread ();
|
|
struct gomp_team *team = thr->ts.team;
|
|
struct gomp_task *task = thr->task;
|
|
struct gomp_task *child_task = NULL;
|
|
struct gomp_task *to_free = NULL;
|
|
|
|
gomp_mutex_lock (&team->task_lock);
|
|
if (gomp_barrier_last_thread (state))
|
|
{
|
|
if (team->task_count == 0)
|
|
{
|
|
gomp_team_barrier_done (&team->barrier, state);
|
|
gomp_mutex_unlock (&team->task_lock);
|
|
gomp_team_barrier_wake (&team->barrier, 0);
|
|
return;
|
|
}
|
|
gomp_team_barrier_set_waiting_for_tasks (&team->barrier);
|
|
}
|
|
|
|
while (1)
|
|
{
|
|
if (team->task_queue != NULL)
|
|
{
|
|
struct gomp_task *parent;
|
|
|
|
child_task = team->task_queue;
|
|
parent = child_task->parent;
|
|
if (parent && parent->children == child_task)
|
|
parent->children = child_task->next_child;
|
|
child_task->prev_queue->next_queue = child_task->next_queue;
|
|
child_task->next_queue->prev_queue = child_task->prev_queue;
|
|
if (child_task->next_queue != child_task)
|
|
team->task_queue = child_task->next_queue;
|
|
else
|
|
team->task_queue = NULL;
|
|
child_task->kind = GOMP_TASK_TIED;
|
|
team->task_running_count++;
|
|
if (team->task_count == team->task_running_count)
|
|
gomp_team_barrier_clear_task_pending (&team->barrier);
|
|
}
|
|
gomp_mutex_unlock (&team->task_lock);
|
|
if (to_free)
|
|
{
|
|
gomp_finish_task (to_free);
|
|
free (to_free);
|
|
to_free = NULL;
|
|
}
|
|
if (child_task)
|
|
{
|
|
thr->task = child_task;
|
|
child_task->fn (child_task->fn_data);
|
|
thr->task = task;
|
|
}
|
|
else
|
|
return;
|
|
gomp_mutex_lock (&team->task_lock);
|
|
if (child_task)
|
|
{
|
|
struct gomp_task *parent = child_task->parent;
|
|
if (parent)
|
|
{
|
|
child_task->prev_child->next_child = child_task->next_child;
|
|
child_task->next_child->prev_child = child_task->prev_child;
|
|
if (parent->children == child_task)
|
|
{
|
|
if (child_task->next_child != child_task)
|
|
parent->children = child_task->next_child;
|
|
else
|
|
{
|
|
parent->children = NULL;
|
|
if (parent->in_taskwait)
|
|
gomp_sem_post (&parent->taskwait_sem);
|
|
}
|
|
}
|
|
}
|
|
gomp_clear_parent (child_task->children);
|
|
to_free = child_task;
|
|
child_task = NULL;
|
|
team->task_running_count--;
|
|
if (--team->task_count == 0
|
|
&& gomp_team_barrier_waiting_for_tasks (&team->barrier))
|
|
{
|
|
gomp_team_barrier_done (&team->barrier, state);
|
|
gomp_mutex_unlock (&team->task_lock);
|
|
gomp_team_barrier_wake (&team->barrier, 0);
|
|
gomp_mutex_lock (&team->task_lock);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Called when encountering a taskwait directive. */
|
|
|
|
void
|
|
GOMP_taskwait (void)
|
|
{
|
|
struct gomp_thread *thr = gomp_thread ();
|
|
struct gomp_team *team = thr->ts.team;
|
|
struct gomp_task *task = thr->task;
|
|
struct gomp_task *child_task = NULL;
|
|
struct gomp_task *to_free = NULL;
|
|
|
|
if (task == NULL || team == NULL)
|
|
return;
|
|
|
|
gomp_mutex_lock (&team->task_lock);
|
|
while (1)
|
|
{
|
|
if (task->children == NULL)
|
|
{
|
|
gomp_mutex_unlock (&team->task_lock);
|
|
if (to_free)
|
|
{
|
|
gomp_finish_task (to_free);
|
|
free (to_free);
|
|
}
|
|
return;
|
|
}
|
|
if (task->children->kind == GOMP_TASK_WAITING)
|
|
{
|
|
child_task = task->children;
|
|
task->children = child_task->next_child;
|
|
child_task->prev_queue->next_queue = child_task->next_queue;
|
|
child_task->next_queue->prev_queue = child_task->prev_queue;
|
|
if (team->task_queue == child_task)
|
|
{
|
|
if (child_task->next_queue != child_task)
|
|
team->task_queue = child_task->next_queue;
|
|
else
|
|
team->task_queue = NULL;
|
|
}
|
|
child_task->kind = GOMP_TASK_TIED;
|
|
team->task_running_count++;
|
|
if (team->task_count == team->task_running_count)
|
|
gomp_team_barrier_clear_task_pending (&team->barrier);
|
|
}
|
|
else
|
|
/* All tasks we are waiting for are already running
|
|
in other threads. Wait for them. */
|
|
task->in_taskwait = true;
|
|
gomp_mutex_unlock (&team->task_lock);
|
|
if (to_free)
|
|
{
|
|
gomp_finish_task (to_free);
|
|
free (to_free);
|
|
to_free = NULL;
|
|
}
|
|
if (child_task)
|
|
{
|
|
thr->task = child_task;
|
|
child_task->fn (child_task->fn_data);
|
|
thr->task = task;
|
|
}
|
|
else
|
|
{
|
|
gomp_sem_wait (&task->taskwait_sem);
|
|
task->in_taskwait = false;
|
|
return;
|
|
}
|
|
gomp_mutex_lock (&team->task_lock);
|
|
if (child_task)
|
|
{
|
|
child_task->prev_child->next_child = child_task->next_child;
|
|
child_task->next_child->prev_child = child_task->prev_child;
|
|
if (task->children == child_task)
|
|
{
|
|
if (child_task->next_child != child_task)
|
|
task->children = child_task->next_child;
|
|
else
|
|
task->children = NULL;
|
|
}
|
|
gomp_clear_parent (child_task->children);
|
|
to_free = child_task;
|
|
child_task = NULL;
|
|
team->task_count--;
|
|
team->task_running_count--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Called when encountering a taskyield directive. */
|
|
|
|
void
|
|
GOMP_taskyield (void)
|
|
{
|
|
/* Nothing at the moment. */
|
|
}
|
|
|
|
int
|
|
omp_in_final (void)
|
|
{
|
|
struct gomp_thread *thr = gomp_thread ();
|
|
return thr->task && thr->task->final_task;
|
|
}
|
|
|
|
ialias (omp_in_final)
|